Static air mixer

Abstract

The invention discloses a static air mixer. Return distribution air and combustion-supporting air are introduced by utilizing a Venturi structure, are completely mixed under the action of a Venturi effect, keep at a complete importing state constantly, and are matched with a spiral air mixing channel, so that air flows are continuously blended and mixed uniformly, and the effects on uniformly mixing, reducing the oxygen content and outputting are achieved. According to the static air mixer, the return distribution air and the combustion-supporting air are introduced by utilizing the Venturi structure, are completely mixed under the action of the Venturi effect, keep at the complete importing state constantly, and are matched with the spiral air mixing channel, so that the air flows are continuously blended and mixed uniformly, and the effects on uniformly mixing, reducing the oxygen content and outputting are achieved.

Description

technical field [0001] The present application relates to a static air mixer. Background technique [0002] In actual engineering implementation, we often encounter the situation of exhaust gas redistribution, which is to mix the exhaust gas with low oxygen content after combustion into the combustion air in proportion to reduce the oxygen content of the combustion air, and reduce the temperature of the combustion chamber to reduce the thermal type. The production of nitrogen oxides, which is commonly referred to as low-nitrogen combustion, requires that the exhaust gas be evenly mixed with the combustion air in proportion to effectively reduce the production of NOx. [0003] The inventors found that the redistribution rate of exhaust gas required by low-nitrogen combustion generally accounts for 15-20% of the exhaust air, which is generally pressurized by the booster fan and then merged into the main pipeline of the combustion-supporting air; but if it is directly imported,...

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Problems solved by technology

[0003] The inventors found that the redistribution rate of exhaust gas required by low-nitrogen combustion generally accounts for 15-20% of the exhaust air, which is generally pressurized by the booster fan and then merged into the main pipeline of the combustion-supporting air; but if it is directly imported, the two streams of air will interfere with each other , due to the inconsistent pressure, it is difficult to meet the requirement of completely inflowing in proportion. Even if the pressure is adjusted to balance the inflow as much as possible, it is difficult to achieve complete inflow and maintain a complete inflow state due to the fluctuation of the pressure head of the centrifugal fan; figure 1 The traditional mixing method shown will flow in a laminar flow mode after mixing and cannot be mixed uniformly with the combustion air. Due to the fluctuation of the return air flow and the inhomogeneity of the flow field, the effect of low-nitrogen combustion will be greatly reduced, and it is difficult to effectively reduce The generation of NOx cannot meet the needs of low-nitrogen combustion

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